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          <h1 class="post-title" itemprop="name headline">TCP客户端/服务端各种异常连接分析</h1>
        

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        <h3 id="TCP客户端和服务端各种异常连接分析-UNP第5章"><a href="#TCP客户端和服务端各种异常连接分析-UNP第5章" class="headerlink" title="TCP客户端和服务端各种异常连接分析(UNP第5章)"></a>TCP客户端和服务端各种异常连接分析(UNP第5章)</h3><ol>
<li><p>accept返回前连接终止<br> <div id="sequence-0"></div><br> 三次握手完成，调用accept前有耗时操作，此时客户端发送RST到服务端，根据不同的实现accept会有不同的返回值。</p>
</li>
<li><p>服务器进程终止</p>
<p> 服务器进程终止会关闭所有文件描述符，发送FIN到客户端，客户端收到FIN后会发送ACK，这时四次挥手已经完成一半。等待客户端关闭文件描述符，发送FIN到服务端。</p>
</li>
<li><p>服务器主机崩溃</p>
<p> 服务器主机崩溃后，再次发送数据会收到ETIMEOUT或EHOSTUNREACH错误，如果想快速检测出这种错误需要设置一个超时，或者设置SO_KEEPALIVE套接字选项。</p>
</li>
<li><p>服务器崩溃后重启</p>
<p> 当服务器崩溃重启后，它的所有连接信息都丢失，因此服务器对于所有收到的来自客户机的数据都响应RST。</p>
</li>
<li><p>服务器主机关机</p>
<p> 和服务器进程终止情况类似。<br><script src="https://cdnjs.cloudflare.com/ajax/libs/webfont/1.6.27/webfontloader.js"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/snap.svg/0.4.1/snap.svg-min.js"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/js-sequence-diagrams/1.0.6/sequence-diagram-min.js"></script><textarea id="sequence-0-code" style="display: none">    Note left of client: connect阻塞
    client->server: SYN
    Note right of server: SYN_RCVD
    server->client: SYN+ACK
    Note left of client: connect 返回
    client->server: ACK
    Note right of server: ESTABLISHED
    client->server: RST
    Note right of server: 调用accept</textarea><textarea id="sequence-0-options" style="display: none">{"scale":1,"line-width":2,"line-length":50,"text-margin":10,"font-size":12,"theme":"simple"}</textarea><script>  var code = document.getElementById("sequence-0-code").value;  var options = JSON.parse(decodeURIComponent(document.getElementById("sequence-0-options").value));  var diagram = Diagram.parse(code);  diagram.drawSVG("sequence-0", options);</script></p>
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